Alert archive / Pennsylvania / Snow Squall Warnings in 2019

Snow Squall Warning 2, NWS Pittsburgh, PA

December 18, 20194 counties in Pennsylvania; Harrison County, Jefferson County, Ohio; Brooke County, Hancock County, Ohio County, West Virginia

NWS Pittsburgh, PA issued this snow squall warning at Dec 18, 2019, 2:12 PM EST for 4 counties in Pennsylvania; Harrison County, Jefferson County, Ohio; Brooke County, Hancock County, Ohio County, West Virginia. It was in force for 63 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Dec 18, 2019, 2:12 PM EST (19:12 UTC)
Expired: Dec 18, 2019, 3:15 PM EST
In force: 63 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon

Counties Harrison County, OH, Jefferson County, OH, Allegheny County, PA, Fayette County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Hancock County, WV, Ohio County, WV

The radar

The Pittsburgh radar (KPBZ), 30 km from the middle of the area, began a volume at 19:15 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 7.2 hours before the alert went out and 25 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 588 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this snow squall warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Pittsburgh, PA wrote its last area forecast discussion before this snow squall warning went out at Dec 17, 3:24 PM EST, 22 hours 48 minutes earlier.

Area forecast discussion, Dec 17, 3:24 PM EST, 22 hours 48 minutes before

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The office that day

Everything else NWS Pittsburgh, PA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 18, 10:51 AM EST	Special Weather Statement	PBZ	Clarion, Jefferson, Mercer	54 min
Dec 18, 10:55 AM EST	Special Weather Statement	PBZ	Allegheny, Beaver, Westmoreland	65 min
Dec 18, 11:51 AM EST	Special Weather Statement	PBZ	Armstrong, Butler, Clarion, Indiana, Jefferson, Lawrence and 1 more	84 min
Dec 18, 12:19 PM EST	Special Weather Statement	PBZ	Armstrong, Butler, Clarion, Indiana, Jefferson, Lawrence and 1 more	86 min
Dec 18, 12:29 PM EST	Special Weather Statement	PBZ	Allegheny	91 min
Dec 18, 1:02 PM EST	Special Weather Statement	PBZ	Allegheny	43 min
Dec 18, 1:50 PM EST	Special Weather Statement	PBZ	Allegheny, Washington, Westmoreland	55 min
Dec 18, 3:14 PM EST	Snow Squall Warning	PBZ	Allegheny, Fayette, Washington, Westmoreland	61 min
Dec 18, 4:16 PM EST	Special Weather Statement	PBZ	Fayette	59 min
Dec 18, 4:32 PM EST	Special Weather Statement	PBZ	Greene	43 min
Dec 18, 5:31 PM EST	Special Weather Statement	PBZ	Fayette	44 min
Dec 18, 1:51 PM EST	Wind Chill Advisory	PBZ	Tucker	18 hr
Dec 18, 6:54 PM EST	Snow Squall Warning	PBZ	Preston	51 min

Nearby

Snow Squall Warnings in Pennsylvania, 2019 Snow Squall Warnings in West Virginia, 2019 Snow Squall Warnings in Ohio, 2019 Every snow squall warning in 2019

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.